Relay.



` RELAY. APPLIGATION FILED SEPT. 23, 1913 Patented Deo.22,1914 v TE STATES EDWARD B. CRAFT, OF HACKENSACK, NEW JERSEY, ASSIGNOR 'I O WESTERN ELEGTEIC I RELAY.

meneer.

of which the following is a full, clear, conoise, and exact description.

This invention relates to an electromagnetic relay and has for its .object the production of a relay of this type whichis chan' acterized b its simple and, at the saine time, strong meclianical construction, .its electrical efiiciency and the ease with which the normal tendencies of some of the contact members are utilized to facilitate the adjustment. With these objects in view, the core of the relay' is formed of a flat'substantially T- shaped punching) of magnetic material. Upon they longer ranch or shank of the T- slia i ed piece the magnetizing coil is Wound, The shorter or cross-piece serves as a supporting means for tlieentire relay structure, and in conjunction witha pair olf additional punchings secured thereto provides means for supporting the armature, various contact springs and the inclosing casing. (larried bythe outer end of the core piece 1 s a plate mounted at right angles thereto, wh 1cli plate s ,erves as a support for adjusting screws, by means of which the c ontact springs and armature are easily adjusted. These screws extend forwardly from the plate and make it possible to adjust 'various parts of the relay lfrom the front witliout removing the relay from its easing or detaching the relay from its support.

For a more complete understanding of the invention reference may be had to the accompanying drawing in which- Figure l is a perspective view of a relay embodying the invention, the inclosing casing being shown in dotted lines; Fig. 2 is a top plan view, the inclosing case and part of one vof the supporting lugs being cut awaylto more clearly show the arrangement of the contact springs; Fig. Sis a bottom vieuT with the casing removed; and Fig. el

is a perspective view of the core and its supporting pieces.

The vsame reference numerals designate like parts in all of the figures.

Referring to tliedrawing, with particular reference to Fig. 4, the core piece is shown as4 a substantially 'ir-shaped punchlSpecification of Letters Patent. Patgnted Dee. 22, 19,14.' Application led September 23, 1,913. Serial No. 791,345. I

ing of magnetic material, preferably silicon st el, comprising a shank portion 2, a cross'- piece 3 and an enlarged portionl which 'serves as a pole piece. Secured tothe crosspiece 3 are two similar sheet metalpunchings 4 and 5. The punching 5 is provided with a 'plurality of ears 6, 7 and 8 bent at right angles thereto, the ears 6 and 7 being 'disposed in parallel planes, and the ea-r 8 being disposed in a planeat ri ht an les to ears 6 and 7. The g' g punching 4 is provided ,with threel ears 9, l0 and 11 corresponding to the ears 6, 7 Aand 8. The ears Sandll are provided with an embossed projection l2 provided 'with an interiorly threaded yaperture as shown in Fig. l. These threaded apertures in combination with suitable screws, provide means for mounting the core and relay parts carried thereb upon the usual relay rack. rlhe ears 6, 9 and 10 are provided with apertures 13 which register with corresponding apertures iii the casing 14, and in conjunction with suitable screws,- provide means for securing the ears 6, 7, 9 and 10 to the casing 14. Mounted upon the shank 2-of the core near the outer extremity thereof and at vthe rear ofthe pole piece 1, is a support inthe form of a plate l5. This plate is mounted at right angles to the core and its periphery is eiiibraced by the casing14= s o thatthe plate l5 serves as a spacing member and prevents .its rear end to the cross-piece 3 of the core through the agency of the punchings 4 and 5, and the front end of the casing engages the plate 15,V the casing acts to stillen the entire structure and to reinforce the core piece against bending' stresses. The casing 1 4 is made oi' either magnetic or non-magnetic material, and also serves as a shield to protect the relay from outside magnetic influences which are likely to cause cross-talk,

when a number of relays are niountedin close proximity. The armature 16 is formed from a substantially U-shaped punching of` magnetic material, comprising a yoke piece 17 and two ,backwardly extending arms 18 and 19. The two extremities-,ijf the arms 18 and 1.9.are secured to resilzenlsheet metal arms 20 and 21. These arms 20l and 2l project from and are integral ivai'i a yoke piece,

not shown, which is clamped between the cross-piece 3 of the core the punching 11o "2. j j y 1,121,897

4, thus providing a resilient support for the armature. The yoke piece 16 of the armatui'e is provided withan oiset portion 22- and by virtue of suoli offset portion and the shape of the armature, such armature lies substantiall in the plane'of the core piece. he core piece in'conjunction with the armature forms the magnetic circuit of'the relay.

' Mounted upon the puiichings 4 and 5, re-

i spectively, and insulated therefroimare two fot the contact springs 23 and 24 are two contact points and 26 which cooperate with two contact points 27 and 2S carried by the outer end ofthe armature, the arrangement being suoli Vthat when the cni tact between points 25 and 27 is made, the

. tively. connected therewith.

' therefrom.

contact between points 26 and 28 is broken. These relatively fixed contacts 25 and 26, because of the tension' in springs 23 and 24, tend to recede,f r0m their companion movable contacts 27: and 28, such tendency being utilized to regulate tlieiixed position as hereinafter explained.

`As shown iii Fig. l, the contact springs 23 and 24 as well as the aiiiis 18 and 19, of the armature project forwardly through cut out portions of the plate 15. Strips of insulating material indicated as 29 serve to insulate the contact springs from the punching .4 and from the armature 16 mounted thereon. Extending backwardly from the contact springs 23 and 24 are two terminals 30 and 31 ,whichmay be, and preferably are, .integral with such contact springs, although they maybe clamped or otherwise conduc- Glaniped betweentae insulating strip 29 above referred' to andthe -punching 4, is a backwardly eX- tending terminal 32, which is conductively connected to the armature through' the punching 4. Superposed upon the terminal 30 is a strip of insulating-:material33 and clamped between such' strip of insulating material and a similar strip 34 is a terminal A similar terminal 36 is secured belowA the terminal 31 and' is suitably insulated A screw 37 passesthrough the insulating strip 34, terminal 35, insulating strip 33, terminal 30, insulating istrip 29,.

' terminal 32, punching 4, sheet metal strip 20,l the cross-piece 3, punching' and terminals 31 and 36, -and serves to secure all such parts lto the cross-piece 3, As the terminals 30 and 31are a part of tl e Contact springs 2,3'and- 24, the screw'37 avso serves to secure such -contact springsl to the coie.

The contact spring v23, as shown in Figs. 1 and 2, is divided into three sections yf These contact' 'from dust, a

ineens of two reverse bends 38 and 39. That portion of the contact spring 23 which projects forward oi' the bend 39 is substantially parallel 'with the core piece; that portion which is included between the bends 38 and 3s is obliolnely-inclined from the plane of the core piece; sind that portion which .ex-

- tends to the rear of the bend 38 is inclined in the oppositel direction toward the core. That part of 'the contact spring which is included between the bends 38 and 39 forms an incline or cam surface with which. an adjusting screw 40 cooperates. Adjusting screw 40 provided, ontits inner end, with an insulating vpoint 41 which seryes as an abutment for the contact spring y23 whose n resiliency causes the cam surface" thereof to be firmly pressed againsttlie vpoint 41. The

Contact spring is thus lirnily held-by the screw 40 against botliits own resiliency and the torce exerted bythe movable contact 2T, thereby insuring a satisfactoiypressure between the contact points. 'It is also readily apparent that when the adjusting screw 40 is screwed in, the outer end ol:

the contact spring is moved, against the force of its normal tension, in the opposite direction toward the core.

The contact spring 24 1s bent in a similar manner to the contact spring- 23 and the' portion of such contact spring includedkbetween the bends 42 and 43 coperateswith an adjusting screw 44 in the samev manner as the similar portion of the contact spring i coperates with the adjustingscrew 40. 'lhe adjusting screw 44is also provided with an insulating point 45. These adjusting screws 44 and 45 are litted into the plate I 15 and .project forwardly out of the casing 14 so ,that they may bel manipulated from the front and the contact springs adjusted without removing the casing 14. The armature -16 is maintained in its normal position away ,from the pole piece by means-of a tensioning spring `4 6. This spring is attached at one end to the arm 19 of the arinature|and at its other end is provided with a bent portion 47,fwhichfcoperatesr with an adjusting screw 48 by means of which 4the tension on the armature may be adjusted. The adjusting screw 48 is also mounted on the plate 15 and extends forwardly out of the casing 14 so that it may be easily adjusted without removing the casing. Mounted adjacent the cross-piece 3 andthe plate 15 are two insulating heads 49 and 50.` These `insulating heads are mounted at right angles to the core and in conjunction with the shank 2 of such core form a spool about which vthe magnetizing coil 51 is wound. The ends ofI the winding of the coil 51 are brought out and are connected to the terminals 35 and 3G. 1n order to protect the relay structure cover 52 for the casing/5F14,

iis

,is provided, which cover is provided with a handle portion 53 to facilitate its removal. In the operation of the relay above described, the passage of current through the core 51, causes the transverse portion 17 of the armature to be attracted by the forwardly projecting pole piece 1 so that the forward or free portion of the armature is drawn down against the pole piece 1, the contact piece 28 being brought into contact with the contact 26 carried by the contact spring 24, and the contact between the contact points and 27 being broken, whereby certain circuit. changes are eected.

It will be noted that the magnetizing circuit formed bythe core and the U-shaped. armature, is substantially a closed circuit except for the normal air-gap between the pole piece 1 and the transverse portion 17 of the armature. By reason of this the relay is extremely sensitive and operates efficiently on a current of low voltage.

Because of the fact that the relay hereinbefore described is constructed of comparatively few and simple parts it may be readily assembled, and being formed of metal punchings it is simple and cheap to manu- Iacture.

'/lhe relay is also entirely inclosed in a i metallic casing which shields it from outside magnetic infiuences, and by virtue of the arrangement of the various adjusting screws, the adjustment of the contact springs and of the tension of the armature may be effected by merely removing the cap 52 and without disturbing the casing or the mounting of the relay.

`Having described my invention, what I claim and desire to secure by Letters Pat- A 4" ng a core, an energizing coil thereon, a movable armature, a movable ent is: A.,

A relay compri contact actuated thereby, a relatively fixed Acontact tensioned to tend to recede from said EDWARD B. CRAFT. Witnesses:

ALICE HAZLEY, 'EDNA D. MAGURK. 

